D defs.my
Entry 1 sense Webster, 1913

Isomer

/(ī"sō̇*mẽr)/ · I·so·mer · IPA /ˈaɪ.sə.mɚ/
01 n. A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member o…
  1. 1.
    A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member of an isomeric series.(Chem.)